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A Primary Side Regulation (PSR) Controller is a device that can regulate the output voltage and current of a power supply by using the information from the primary side only, without the need for any feedback circuitry or current sensing on the secondary side.
This reduces the complexity, cost and losses of the power supply design, and improves the efficiency and reliability of the system. PSR controllers are commonly used in flyback converters operating in discontinuous conduction mode (DCM), where the output voltage can be determined by measuring the peak current and off-time of the primary switch. Some of the advantages of PSR controllers are:
They can provide isolation between the input and output sides of the power supply, which improves safety and noise immunity. They can achieve high power factor correction (PFC) and low total harmonic distortion (THD) by using line feed-forward or valley switching techniques.
They can support a wide input voltage range and output multiple voltages with a single transformer5. They can implement various protection features such as output overvoltage, brownout detection, transformer saturation detection, and feedback loop disconnection.
Some of the challenges of PSR controllers are: They require accurate modeling and compensation of the transformer parasitics and non-linearities.They may suffer from output voltage drift or oscillation due to temperature variations or load transients. They may have higher output ripple and noise than secondary-side regulation controllers.
The Global Primary Side Regulation Controller market accounted for $XX Billion in 2022 and is anticipated to reach $XX Billion by 2030, registering a CAGR of XX% from 2023 to 2030.
The UCC28730 from TI is a low-power zero standby PSR flyback controller with CVCC and wake-up monitoring. The UCC28780 from TI is a high-efficiency active-clamp flyback controller with adaptive zero-voltage switching (ZVS) and advanced burst mode.
ST’s VIPer0P, a sense-FET3 and embedded HV starting zero-power offline high-voltage converter, is used.Multi-mode controllers for SMPSs with PFC front-end and configurable fixed frequency or quasi-resonant operation are the ST L6566A/B/BH.For offline LED lighting applications, MPS’s MP020-5 is a primary-side CC/CV controller with an inbuilt 700 V MOSFET.
